Diesel engines have the advantages of high thermal efficiency, good economy, and easy starting, making them highly adaptable to various types of ships. After their release, they were quickly used as propulsion power and power supply for ships. In newly built ships, diesel engines have almost completely replaced steam engines. Marine diesel engines have become the main power source for civilian ships, small and medium-sized vessels, and conventional vessels.

Marine diesel engines are generally divided into high-speed, medium speed, and low-speed diesel engines. The air filter is located in the engine intake system and is an assembly composed of one or several clean air filter components. It is one of the most important components on the engine.
Due to the harsh conditions of the ship's operation on water or sea, the probability of damage to the air filters used on it is very high, and they need to be replaced every few months. After practical summary, it has been found that the air filters currently in use have the following problems.

1. Spot welding instead of seam welding is used to weld the air filter housing components, which cannot guarantee sealing and causes short circuits
2. The filter element in the oil filter is damaged and blocks the oil circuit, resulting in insufficient lubrication of the engine or poor reliability at the bite point. During use, the bite point is pulled open, causing a large amount of oil leakage in a short period of time, resulting in tile burning and shaft sticking
3. The metal components such as the end cover, center pipe, and outer shell of the filter element were not treated with rust prevention, resulting in metal rust and impurities, making the filter a source of pollution
The fixing of the sealing device on the upper cover of the air filter is non removable. Once the sealing ring ages, the entire filter will be scrapped, causing energy and material waste, as well as pollution.